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97392 PROTECTION OF REINFORCED CONCRETE PIPE AGAINST MICROBIAL INDUCED CORROSION

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Product Number: 51300-97392-SG
ISBN: 97392 1997 CP
Author: Howard Kennedy
Industry: Water/Wastewater
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This paper evaluates the internal lining solutions to the problem of microbial induced corrosion in municipal wastewater applications as it relates to reinforced concrete pipe used in new or replacement construction. Microbial Induced corrosion (MIC), commonly referred to as hydrogen sulfide (H2S) corrosion, in Reinforced Concrete Epe (RCP) is caused by sulfuric acid that is produced by bacteria known as Thiobacillus. Thiobacillus genus bacteria exist in the crown area of the pipe and metabolize the hydrogen sulfide (H2S) into sulfuric acid (H2SO4). The sulfuric acid, in turn, corrodes the concrete. This destructive activity amounts to a multi-billion dollar annual cost to municipal wastewater systems around the world. Numerous solutions to MIC are available. The initial step in controlling MIC is to prevent the creation of H2S through proper design of the wastewater system. Other solutions are to place anti-microbial agents in the system to prevent the growth of the bacteria or to provide an additional thickness of concrete that will take longer to corrode. If acid production cannot be prevented, the only solution left is to provide a barrier lining to protect the concrete from the acidic environment. The paper evaluates the common lining systems available in the market today including polyvinyl chloride, 100% solids polyurethane and coal tar epoxy. These materials are compared in terms of performance, application , safety and environmental implications. Key Terms: 100% solids, polyurethane, epoxy, polyvinyl chloride, reinforced concrete pipe, microbial induced corrosion, linings, coatings, municipal wastewater, H2S corrosion
This paper evaluates the internal lining solutions to the problem of microbial induced corrosion in municipal wastewater applications as it relates to reinforced concrete pipe used in new or replacement construction. Microbial Induced corrosion (MIC), commonly referred to as hydrogen sulfide (H2S) corrosion, in Reinforced Concrete Epe (RCP) is caused by sulfuric acid that is produced by bacteria known as Thiobacillus. Thiobacillus genus bacteria exist in the crown area of the pipe and metabolize the hydrogen sulfide (H2S) into sulfuric acid (H2SO4). The sulfuric acid, in turn, corrodes the concrete. This destructive activity amounts to a multi-billion dollar annual cost to municipal wastewater systems around the world. Numerous solutions to MIC are available. The initial step in controlling MIC is to prevent the creation of H2S through proper design of the wastewater system. Other solutions are to place anti-microbial agents in the system to prevent the growth of the bacteria or to provide an additional thickness of concrete that will take longer to corrode. If acid production cannot be prevented, the only solution left is to provide a barrier lining to protect the concrete from the acidic environment. The paper evaluates the common lining systems available in the market today including polyvinyl chloride, 100% solids polyurethane and coal tar epoxy. These materials are compared in terms of performance, application , safety and environmental implications. Key Terms: 100% solids, polyurethane, epoxy, polyvinyl chloride, reinforced concrete pipe, microbial induced corrosion, linings, coatings, municipal wastewater, H2S corrosion
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